theorem 3.1 [1]}
Let \(\mathcal {A}\)  be an order \(m\)  and dimension \(n\)  tensor. Then \(\mathcal {A}\)  is row diagonal if and only if \(\mathcal {A}=M(\mathcal {A})\mathcal {I}_m\)  where \(\mathcal {I}_m\)  is the identity tensor of order \(m\)  and dimension \(n\) .

